31.A star will compress itself into a white dwarf, a neutron star, or a black hole after it passes through a red giant stage, depending on mass.

（A）A star will compress itself into a white dwarf, a neutron star, or a black hole after it passes through a red giant stage, depending on mass.
depending on mass为什么不能理解为优先做伴随结构，修饰A star？如果这样的话，A似乎没有问题了！
(D) Mass determines whether a star, after passing through the red giant stage, will compress itself into a white dwarf, a neutron star, or a black hole.

而D中似乎改变了原来的句子重心（原来的主句变成了宾语从句了）？

depending on mass.
shoould be "depending on its mass." and depending on its mass, a star......